As Alcester tired and Manor finally made the ball stick, their indiscretions increased with failures to roll away from tackles and remain onside.
Dan Joyce punched over another penalty to give Park the lead for the first time on the hour, and from that point onwards, it seemed there would only be one winner.
Park’s bit for victory was hampered by the yellow card awarded to Tom Hill, who paid the price for his team’s persistent offsides.
With a man advantage Alcester surged forward and earned penalties of their own to gobble up territory, but it was an uncomfortable bobbling kick over Aaron’s head which caused the greatest concern, eventually leading to an attacking five metre scrum.
For all Manor’s frustrating lack of cohesion on the attack, their defence was a well-oiled machine with big ball carriers getting little joy from picking and driving.
Joyce had an opportunity to extend his side’s lead to six but sliced his effort wide.
A dysfunctional lineout finally found some efficiency and at scrum time Manor began to turn the screw, and it was from the pack where Manor scored the game’s only try.
From ten metres out Park ambled forward, with scrum half Liam Rose resisting the temptation to spin the ball, eventually allowing Aaron Willis to pick and drive over for a converted try.
Park had a golden chance for a second score when another lively break from Willis, who along with Adam Lawrence was responsible for most of Park's hard yards gained, saw a lovely offload to Maddison whose angled run was stopped metres from the line.
The final whistle was greeted with muted celebrations, this victory was fraught with errors but it was a win nevertheless which keeps pressure on table toppers Ledbury – reducing the gap at the top to eight points with a game in hand.
But third place Old Wheats kept the pressure on with a bonus point success over Coventry Welsh.